磁性Fe3O4纳米晶的电化学制备及在线混凝过程研究

doi:10.7503/cjcu20140422

高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (12): 2529.doi: 10.7503/cjcu20140422

• 研究论文: 无机化学 • 上一篇下一篇

磁性Fe₃O₄纳米晶的电化学制备及在线混凝过程研究

林松竹, 陈欢欢, 李艺花, 贾若琨()

东北电力大学化学工程学院, 吉林 132012

收稿日期:2014-05-08 出版日期:2014-12-10 发布日期:2014-10-23
作者简介:联系人简介: 贾若琨, 男, 博士, 教授, 主要从事材料物理化学研究. E-mail:jiaruokun@mail.nedu.edu.cn
基金资助:
国家自然科学基金(批准号: 51003010)、吉林省科技发展计划项目(批准号: SKLSSM201132, 20140101090JC)和东北电力大学博士科研启动基金(批准号: 11084)资助

Electrochemical Preparation of Magnetic Fe₃O₄ Nanocrystalline and Its Online Coagulation Properties^†

LIN Songzhu, CHEN Huanhuan, LI Yihua, JIA Ruokun^*()

College of Chemical Engineering, Northeast Dianli University, Jilin 132012, China

Received:2014-05-08 Online:2014-12-10 Published:2014-10-23
Contact: JIA Ruokun E-mail:jiaruokun@mail.nedu.edu.cn
Supported by:
† Supported by the National Natural Science Foundation of China(No.51003010), the Science and Technology Development Program of Jilin Province, China(Nos.SKLSSM201132, 2014101090JC) and the Doctoral Researeh Start-up Founding of the Northeast Dianli University, China(No.11084)

摘要/Abstract

摘要：

以铁片和碳纤维为电极, 采用电化学法实现了磁性Fe₃O₄纳米晶混凝剂的快速制备、在线混凝和磁性过滤的预处理过程. 采用X射线衍射仪(XRD)和扫描电子显微镜(SEM)等对磁性Fe₃O₄纳米晶进行了表征. 结果表明, 所制备的磁性Fe₃O₄纳米晶具有均匀的晶体尺寸, 粒子尺寸分布在30~100 nm之间. 利用Fe₃O₄纳米晶对高浊度高岭土悬浊液进行了混凝研究, 并在外加磁场的作用下实现了絮凝体和水体的快速分离. 结果证实电化学法磁混凝技术能够快速高效去除污水浊度, 省去了机械过滤过程. 理论研究结果表明, 磁性Fe₃O₄纳米晶去除浊度的过程是电荷中和与沉淀卷扫共同作用的结果, 而电荷中和过程发生是由于电化学制备Fe₃O₄纳米晶时表面电荷种类的均一性.

关键词: 电化学法, 磁性Fe3O4纳米晶, 在线混凝

Abstract:

The online preparation and coagulation of magnetic Fe₃O₄ nanocrystallines were realized by electrochemical method with iron and carbon fiber as electrode. The product was characterized by X-ray diffraction(XRD) and scanning electron microscope(SEM). The results show that the Fe₃O₄ nanocrystallines have uniform crystallite size, but with particle size between 30 nm and 100 nm. The coagulation study of high turbidity kaolin suspension was carried out, and the separation between flocculation and water was realized under the action of magnetic field. The results confirm that the electrochemically magnetic coagulation technology can quickly and efficiently get rid of the turbidity without mechanical filtration. Theoretical research results show that the electrochemical method can control the Fe₃O₄ types of surface charge, thus improve the effect of charge neutralization in water. The process of removing turbidity was due to the combination of charge neutra-lization and precipitation sweep process.

Key words: Electrochemical method, Magnetic Fe3O4 nanocrystalline, Online coagulation

中图分类号:

TrendMD:

林松竹, 陈欢欢, 李艺花, 贾若琨. 磁性Fe₃O₄纳米晶的电化学制备及在线混凝过程研究. 高等学校化学学报, 2014, 35(12): 2529.

LIN Songzhu, CHEN Huanhuan, LI Yihua, JIA Ruokun. Electrochemical Preparation of Magnetic Fe₃O₄ Nanocrystalline and Its Online Coagulation Properties^†. Chem. J. Chinese Universities, 2014, 35(12): 2529.

图/表 7

Fig.1 XRD pattern of Fe3O4 nanoparticles The inset picture shows the sample before(left) and after(right) magnetic sparation for 2 min.

Fig.2 SEM image of Fe3O4 nanoparticles

Fig.3 Relationship between turbidity removal rate and Fe3O4 dose

Fig.4 Neutralization and furl mechanism of Fe3O4 nanoparticles

Fig.5 Effect of temperature on the turbidity removal

Fig.6 Effect of pH value on the turbidity removal rate

Fig.7 Relationship between Fe3O4 dose and turbidity removal rate with different initial turbidity

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磁性Fe₃O₄纳米晶的电化学制备及在线混凝过程研究

Electrochemical Preparation of Magnetic Fe₃O₄ Nanocrystalline and Its Online Coagulation Properties^†

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